Pensions and Postretirement Benefits Other Than Pensions (Schedule of Fair Values of Company's Pension Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 |
Defined benefit plan, fair value of pension plan assets | $ 2,145.7 | $ 2,051.6 |
Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 4.7 | 3.3 |
Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,497.5 | 1,450.9 |
Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 120.9 | 109.8 |
Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 512.2 | 479.2 |
Registered mutual funds, fixed income specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 96.1 | 105 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
U.S. Government and Agency Obligations [Member] | | |
Defined benefit plan, fair value of pension plan assets | 355.7 | 323.6 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 355.7 | 323.6 |
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Corporate and Non-U.S. Bonds [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,079.5 | 1,065.7 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,079.5 | 1,065.7 |
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Asset-Backed And Mortgage-Backed Securities [Member] | | |
Defined benefit plan, fair value of pension plan assets | 12.5 | 12.5 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 12.5 | 12.5 |
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 75 | 61.7 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | | |
Defined benefit plan, fair value of pension plan assets | 31.2 | 29.3 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 31.2 | 29.3 |
Derivative [Member] | | |
Defined benefit plan, fair value of pension plan assets | 5.9 | (1.5) |
Derivative [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Derivative [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 5.9 | (1.5) |
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Derivative [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Real Estate Funds [Member] | | |
Defined benefit plan, fair value of pension plan assets | | 0.9 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | | 0 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | | 0 |
Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | | 0.9 |
Real Estate Funds [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | | 0 |
Other Defined Benefit [Member] | | |
Defined benefit plan, fair value of pension plan assets | 89.7 | 79.6 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Other Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 89.7 | 79.6 |
Other Defined Benefit [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] | | |
Defined benefit plan, fair value of pension plan assets | 48.6 | 53.9 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 4.7 | 3.3 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 43.9 | 50.6 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 78.7 | 68 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | | |
Defined benefit plan, fair value of pension plan assets | 262.4 | 244.5 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Receivables and Payables | | |
Defined benefit plan, fair value of pension plan assets | 10.4 | 8.4 |
Registered mutual funds, equity specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 78.7 | 68 |
Equity Securities [Member] | | |
Defined benefit plan, fair value of pension plan assets | 341.1 | 312.5 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Equity Securities [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 341.1 | 312.5 |
Commingled funds, equity specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 262.4 | 244.5 |
Fixed Income Investments [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,650 | 1,597.8 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 1,447.7 | 1,401.8 |
Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Defined benefit plan, fair value of pension plan assets | 31.2 | 29.3 |
Fixed Income Investments [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 171.1 | 166.7 |
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 96.1 | 105 |
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 75 | 61.7 |
Fixed Income Investments [Member] | Other Fixed Income [Member] | Net Assets, Segment [Member] | | |
Defined benefit plan, fair value of pension plan assets | 0 | 0 |
Defined Benefit Plan Fair Value of Plan Assets Measured Using Net Asset Value [Member] | | |
Defined benefit plan, fair value of pension plan assets | $ 2,135.3 | $ 2,043.2 |